<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>响应式布局</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        html,
        body {
            height: 100%;
        }

        body {
            background-color: yellow;
        }
     
        @media screen and (min-width:1000px){
            body{
                background-color: yellow;
            }
        }


        @media screen and (max-width:1000px) and (min-width:500px) {
            body{
                background: red;
            }
        }
        @media screen and (max-width:500px) {
            body{
                background-color: green;
            }
        }

    </style>

</head>

<body>

    <div>


    </div>


</body>

</html>